Gas hot air gun

ABSTRACT

A gas hot air gun comprising a main body, an air blower, an ignition device, a nozzle and a switch set; the main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of the barrel, a battery set and a gas can are inside the handle, one end of the nozzle is connected to the gas can, the switch set further comprises of a power switch and an ignition switch; users press the power switch and have gas spray out from the nozzle into the heating chamber to generate heat, the blower sends out hot air in the heating chamber out of the main body; a metal slice to regulate the direction of air and a catalyst to avoid flame out of the nozzle area are inside the heating chamber.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to a hot air gun and, more specifically, to a gas hot air gun that offers smaller physical size for users to carry around, complete burn of gas to reduce carbon mono-oxide and faster cooling down the whole set after application to prevent users from danger of burn.

2. Description of the Prior Art

Heretofore, it is known that the “Internal structure of a hot air gun” of Taiwan Publication no. 83795 comprises of a shell body 1, a hot air pipe pedestal 2, an insulated ceramic pedestal 3, an air pipe 4 and an air blower 5; the shell body 1 contains all the above components; an electrical heating coil 6 wraps around the hot air pipe pedestal 2 externally, the combination is inserted into the insulated ceramic pedestal 3, the air pipe 4 is installed outmost and fixed internally onto the shell body 1; the electrical heating coil 6 generates high temperature air, the air blower 5 blows the hot air out through the air pipe 4.

In real application, the known hot air guns still have many drawbacks; since they need a power core to plug into the wall power to have the electrical hot wire 6 generate hot air, they are not easy to carry, if users apply the hot air gun outdoors, power plugs sometimes are not available, the power generator is needed; the electrical heating coil 6 remains hot after application, users can not pack the hot air gun up right away; users might get burn carelessly very often, the design of known hot air guns is not very safe, not very practical and needs improvement.

SUMMARY OF THE INVENTION

It is therefore a primary object of the invention to provide a gas hot air gun that improves the known hot air guns have to apply AC power to generate heat with an electrical heating coil, and offers smaller physical size for users to carry around, complete burn of gas to reduce carbon mono-oxide and faster cooling down the whole set after application to prevent users from danger of burn.

In order to achieve the objective set forth, a gas hot air gun in accordance with the present invention comprises a main body, an air blower, an ignition device, a nozzle and a switch set; the main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of the barrel, a battery set and a gas can are inside the handle, one end of the nozzle is connected to the gas can, the switch set further comprises of a power switch and an ignition switch; users press the power switch and have gas spray out from the nozzle into the heating chamber to generate heat, the blower sends out hot air in the heating chamber out of the main body; a metal slice to regulate the direction of air and a catalyst to avoid flame out of the nozzle area are inside the heating chamber. The present invention is small in size and easy for users to carry.

BRIEF DESCRIPTION OF THE DRAWINGS

The accomplishment of the above-mentioned object of the present invention will become apparent from the following description and its accompanying drawings which disclose illustrative an embodiment of the present invention, and are as follows:

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an assembly view of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is an application view of the present invention;

FIG. 5 is a cross-sectional view of a further embodiment of the present invention;

FIG. 6 is another cross-sectional view of a further embodiment of the present invention;

FIG. 7 is a perspective view of another application of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 to FIG. 3, the present invention comprises a main body 10, an air blower 20, an ignition device 30, a nozzle 40 and a switch set 50; the main body 10 further consists of a barrel 11 and a handle 12, a heating chamber 111 is inside the barrel 11, a gas can 122 is inside the handle 12, users can press the switch set 50 to have the gas of the gas can 122 spray out from the nozzle 40 into the heating chamber 111, the ignition device 30 ignites the gas inside the heating chamber 111 to generate heat source, the air blower 20 blows the hot air inside the heating chamber 111 externally to the main body 10.

The main body 10 comprises of a barrel 11, a handle 12, an intake 13 and a exhalation hole 14; a heating chamber 111 and a mixing chamber 112 are on the inner front of the barrel 11, a daisy shape metal slice 113 and a catalyst 114 are inside the heating chamber 111, the metal slice 113 is installed inside the heating chamber 111 near the front side of the barrel 11, the catalyst 114 is installed near the end of the barrel 11; a burning chamber 115 is inside the metal slice 113, the mixing chamber 112 in installed on the barrel 11 that is opposite to the location of the heating chamber 111; a shrink 116 near the metal slice 113 is formed on one end of the mixing chamber 112, the shrink 116 is interlinked to the burning chamber 115 of the metal slice 113; several air inhalation holes 117 are around the mixing chamber 112, a passages 118 is between the metal slice 113 and the barrel 11; a tube shape metal net 119 to control the mixing air flow is installed between the burning chamber 115 of the metal slice 113 and the shrink 116 of the mixing chamber 112, a thicker metal net 120 with smaller net holes near the exhalation hole 14 is on one side of the metal net 119. The handle 12 is connected to and beneath the barrel 11, a first container 123 and a second container 124 are inside the handle 12, a battery set 121 and a gas can 122 are inside the first and the second container 123, 124 respectively, the gas can 122 contains burnable fluid, usually is liquid gas; a movable cover 125 is on the bottom of the handle 12 to cover the first and the second container 123, 124. The intake 13 is installed on the end of the barrel 11 for air to flow into the barrel 11; several protective grids 131 are on the intake 13 to prevent users from inserting their fingers in. The exhalation hole 14 is on the front of the barrel 11 to expel air from the barrel 11.

The air blower 20 in installed internally on the end of the barrel 11 to draw air from the intake 13 into the barrel 11, a DC motor is applied in this application, the blower 20 further comprises a motor 21, a fan blade 22 and a temperature sensor 23; the motor 21 locates near one side of the exhalation hole 14, the fan blade 22 is installed on the motor 21 and near one side of the intake 13 to be driven by the motor 21; the temperature sensor 23 is installed around the barrel 11 near the heating chamber 111, the temperature sensor 23 controls the motor 20, after end of application and when the temperature of the heating chamber 111 below certain temperature, the temperature sensor 23 stops the motor 21 from turning.

The ignition device 30 is installed inside the metal slice 113 of the heating chamber 111 to ignite the mixed gas in the heating chamber 111; the ignition device 30 is installed inside the burning chamber 115 of the metal slice 113 in this application.

The nozzle 40 is installed inside the barrel 11 of the main body 10 and located between the blower 20 and the mixing chamber 112; one end of the nozzle 40 is connected to the gas can 122.

The switch set 50 is installed inside the handle 12 of the main body 10 near the barrel 11; the switch set 50 further comprises of a power switch 51, an ignition switch 52 and a regulation valve 53; the power switch 51 connects to the battery set 121 and the blower 20 with electrical wires, the power switch 51 also has a control rod 511 to open and close the gas can 122; the ignition switch 52 connects between the battery set 121 and the ignition device 30 with electrical wires; the regulation valve 53 is installed on the gas can 122 to control the gas flow amount of the gas can 122.

Referring to FIG. 4, when the power switch 51 is pressed on, the control rod 511 opens the gas can 122, the gas sprays out from the nozzle 40, at the same time, the blower 20 blow air from the intake 13 into the mixing chamber 112 to mix the gas and the air blown in; when the mix gas passes the shrink 116, with the shrinking diameter of the shrink 116, the mixed gas is compressed, the mixed air spays out the shrink 116 at a faster speed, the high speed injected mixed air entering the burning chamber 115 of the metal slice 113 flows to the tube shape metal net 119 that guides the flow direction of the mixed gas (referring to FIG. 5), with the two blocks by the thicker metal net 120 on the front of the tube shape metal net 119 and the tube shape metal net 119 itself, since the net holes of the thicker metal net 120 is smaller, the mixed gas is blocked effectively to have most of the mixed gas spays out in all directions. When the ignition switch 52 is pressed, the ignition device 30 ignites the mixed gas and generates flame, the flame expands several tongue of flames from the burning chamber 115 to surround the metal slice 113 and have the temperature of the metal slice 113 rise gradually that forms the first burning; with the better heat exchange rate of the metal slice 113, when the air flow sent by the blower 20 passes through the passage 118 of the metal slice 113, air flow can bring the heat on the metal slice 113 to generate hot air; when the hot air passes through the catalyst 114, the catalyst 114 burns the small quantity left-over gas to reduce the quantity of carbon mono-oxide (CO) that forms the second burning; after two times of burning, the air temperature is higher, the air is safer, the catalyst 114 avoids the burning flame in the metal slice 113 from coming out of the nozzle 14.

The mixed gas needs to have a good ratio of fresh air and gas to be properly burnt, when oxygen contained is too low in the mixed gas, the inhalation holes 117 around the burning chamber 115 offers fresh air; the diameter of the shrink 116 of the mixing chamber shrinks 112 gradually, fresh air is sucked in, mixed with gas and enters the burning chamber 115 to be burnt stably; the quantity of gas can also be controlled by the regulation valve 53; since the metal slice 113 inside the heating chamber 111 has very good heat conductivity, the temperature of the metal slice 113 is lifted rapidly after the ignition inside the burning chamber 115; if the gas in the heating chamber 111 is not burnt properly, the toxic carbon mono-oxide is generated and is harmful to human body; in order to achieve complete burning, the catalyst 114 can achieve such purpose, the catalyst 114 reacts with the burning gas and generates non-toxic carbon di-oxide, the catalyst 114 can also prevent the flame from coming out of the nozzle 14.

The temperature sensor 23 connecting to the blower 20 is installed on the barrel 11 near the heating chamber 111; when power switch 51 is turned off, the nozzle 40 stops spraying, the heating chamber 111 stops burning process but still remains in high temperature condition, the blower 20 can still turn and send fresh air to lower the heating chamber 111 temperature, the metal slice 113 has good heat conductivity to lower the heating chamber 111 temperature with cool air; when the temperature sensor 23 detects the heating chamber 111 reaches certain cool temperature, the blower 20 is stopped, the design makes the present invention easier to carry and prevent users from danger of burn.

Referring to FIG. 6, when either battery set 121 or gas can 122 is out, new battery set 121 or gas can 122 can be replaced; the replacement is very convenient, users only need to lift the movable cover 125 and take the battery set 121 or gas can 122 out from the first or the second container 123, 124 respectively and do the replacement; the gas can 122 can be re-fill type can; the present invention applies gas to generate high temperature to avoid the troublesome of power cord and reduce the space, users are very convenient to carry the present invention around. Referring to FIG. 7, a holder 15 is installed to hold a tube to be heated for faster heating effect.

Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed. 

1. A gas hot air gun comprising: a main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of said barrel, a battery set and a gas can are inside said handle, gas can contains burnable fluid; an air blower in installed internally on the end of said barrel and is powered by the battery set; an ignition device is installed inside said barrel; a nozzle is installed inside said main body, one end of said nozzle is connected to the gas can to spray gas; a switch set is installed inside said main body, said switch set further comprises of a power switch and an ignition switch, users press said power switch and have gas spray out from said nozzle into said mixing chamber to mix with air and then is sent to said heating chamber, said ignition switch has said ignition device ignite the mix gas and generate heat source, said blower blows hot air inside said heating chamber out.
 2. The gas hot air gun according to claim 1, wherein several intakes are installed on the end of said barrel for fresh air to come in.
 3. The gas hot air gun according to claim 1, wherein a holder is installed on the front of said barrel for faster heating effect
 4. The gas hot air gun according to claim 1, wherein a first and a second container are installed in said handle to hole a battery set in said first container and a gas can in said second container.
 5. The gas hot air gun according to claim 1, wherein gas can is a refill type can.
 6. The gas hot air gun according to claim 4, wherein a movable cover is on the bottom of said handle to cover said first and said second container.
 7. The gas hot air gun according to claim 1, wherein said switch set contains a regulation valve.
 8. The gas hot air gun according to claim 1, wherein said switch set is installed on said handle of said main body.
 9. The gas hot air gun according to claim 1, wherein said power switch connects to the battery set and said blower with electrical wires, said power switch also has a control rod to open and close gas can.
 10. The gas hot air gun according to claim 1, wherein said ignition switch connects to said ignition device.
 11. The gas hot air gun according to claim 7, wherein said regulation valve controls the gas flow amount of the gas can.
 12. The gas hot air gun according to claim 1, wherein said heating chamber interlinks to said mixing chamber.
 13. The gas hot air gun according to claim 1, wherein said heating chamber is installed on the front of said barrel, said mixing chamber is installed on said heating chamber near the end of said barrel.
 14. The gas hot air gun according to claim 1, wherein a shrink is formed in said mixing chamber near said heating chamber, the diameter of said shrink is smaller on the end near said nozzle.
 15. The gas hot air gun according to claim 1, wherein several air inhalation holes are around said mixing chamber for fresh air to come in to achieve better gas-air ratio.
 16. The gas hot air gun according to claim 1, wherein a metal slice in inside said heating chamber with good heat exchange rate and heat conductivity to be heated up and cooled down rapidly, said metal slice also has air flow direction regulation effect.
 17. The gas hot air gun according to claim 1, wherein a catalyst is installed in said heating chamber to help mix gas burn completely and reduce the generation of carbon mono-oxide to lift temperature and avoid flame coming out from said nozzle area.
 18. The gas hot air gun according to claim 16, wherein a burning chamber is installed on one end of said metal slice, said burning chamber interlinks to said mixing chamber.
 19. The gas hot air gun according to claim 18, wherein said ignition device is installed inside said burning chamber.
 20. The gas hot air gun according to claim 1, wherein said blower is installed on the end of said barrel.
 21. The gas hot air gun according to claim 20, wherein said blower comprises a motor and a fan blade, said motor locates near the front side of said barrel, the fan blade is installed near the end of said barrel.
 22. The gas hot air gun according to claim 20, wherein said blower comprises a temperature sensor, said temperature sensor is installed around said barrel near said heating chamber, said temperature sensor keeps said motor turning after said power switch is off, when the temperature of said heating chamber goes below certain temperature, said temperature sensor stops said motor from turning.
 23. The gas hot air gun according to claim 1, wherein said nozzle is installed in said barrel of said main body between said blower and said mixing chamber. 